Sonic

Dark Sonic is one of the main antagonist of Shadow and Vegeta Unite!.

Personality
Due to unknown reason, Sonic is now an demonic and sadistic being. Now called, "Dark Sonic," he hunts his opponents with the up most of urgency. Unlike Goku, who choses to act play with his opponents, Sonic choses to end battles quickly. He talks with a harsh voice, that makes him seem like he`s not interested in anything he`s doing. Sonic looks down greatly on his opponents, even more than Goku.

Sonic is completely loyal to Dr. Robotnik. To please him, Sonic has tricked Knuckles into believing he was good, and then struck him as soon as he got what he needed.

Abilities
Sonic hasn`t foughten much in his dark form in the series, so not much is known about how he battles. His speed has increased to near light speeds, as he was able to strike and knock Shadow unconscious in a matter of secounds. Other than that, he retains all of Sonic`s moves except they are now much more powerful.

Transformations
Sonic has shown that he can change back into his original form when needed. He did this to trick Knuckles into believing he was normal in order to get the Chaos Emerald.

Trivia

 * Although he`s called Dark Sonic, no one actually calls him Dark Sonic in the series.